[react-native] update Lists props to match flow Maybe Types. (#41804)

types/react-native/index.d.ts

@@ -52,7 +52,6 @@
 /// <reference path="Devtools.d.ts" />
 /// <reference path="LaunchScreen.d.ts" />
 
-import * as PropTypes from 'prop-types';
 import * as React from 'react';
 
 type Constructor<T> = new (...args: any[]) => T;
@@ -3883,12 +3882,12 @@ export interface FlatListProps<ItemT> extends VirtualizedListProps<ItemT> {
      * Remember to include separator length (height or width) in your offset calculation if you specify
      * `ItemSeparatorComponent`.
      */
-    getItemLayout?: (data: Array<ItemT> | null, index: number) => { length: number; offset: number; index: number };
+    getItemLayout?: (data: Array<ItemT> | null | undefined, index: number) => { length: number; offset: number; index: number };
 
     /**
      * If true, renders items next to each other horizontally instead of stacked vertically.
      */
-    horizontal?: boolean;
+    horizontal?: boolean | null;
 
     /**
      * How many items to render in the initial batch
@@ -3898,7 +3897,7 @@ export interface FlatListProps<ItemT> extends VirtualizedListProps<ItemT> {
     /**
      * Instead of starting at the top with the first item, start at initialScrollIndex
      */
-    initialScrollIndex?: number;
+    initialScrollIndex?: number | null;
 
     /**
      * Used to extract a unique key for a given item at the specified index. Key is used for caching
@@ -3960,7 +3959,7 @@ export interface FlatListProps<ItemT> extends VirtualizedListProps<ItemT> {
      * ```
      * Provides additional metadata like `index` if you need it.
      */
-    renderItem: ListRenderItem<ItemT>;
+    renderItem: ListRenderItem<ItemT> | null | undefined;
 
     /**
      * See `ViewabilityHelper` for flow type and further documentation.
@@ -4107,7 +4106,7 @@ export interface SectionListProps<ItemT> extends VirtualizedListWithoutRenderIte
     /**
      * Reverses the direction of scroll. Uses scale transforms of -1.
      */
-    inverted?: boolean;
+    inverted?: boolean | null;
 
     /**
      * Used to extract a unique key for a given item at the specified index. Key is used for caching
@@ -4250,7 +4249,7 @@ export interface SectionListStatic<SectionT> extends React.ComponentClass<Sectio
  * @see https://facebook.github.io/react-native/docs/virtualizedlist.html#props
  */
 export interface VirtualizedListProps<ItemT> extends VirtualizedListWithoutRenderItemProps<ItemT> {
-    renderItem: ListRenderItem<ItemT>;
+    renderItem: ListRenderItem<ItemT> | null | undefined;
 }
 
 export interface VirtualizedListWithoutRenderItemProps<ItemT> extends ScrollViewProps {
@@ -4317,7 +4316,7 @@ export interface VirtualizedListWithoutRenderItemProps<ItemT> extends ScrollView
         index: number;
     };
 
-    horizontal?: boolean;
+    horizontal?: boolean | null;
 
     /**
      * How many items to render in the initial batch. This should be enough to fill the screen but not
@@ -4332,12 +4331,12 @@ export interface VirtualizedListWithoutRenderItemProps<ItemT> extends ScrollView
      * always rendered and immediately renders the items starting at this initial index. Requires
      * `getItemLayout` to be implemented.
      */
-    initialScrollIndex?: number;
+    initialScrollIndex?: number | null;
 
     /**
      * Reverses the direction of scroll. Uses scale transforms of -1.
      */
-    inverted?: boolean;
+    inverted?: boolean | null;
 
     keyExtractor?: (item: ItemT, index: number) => string;
 
@@ -6199,7 +6198,7 @@ export interface ScrollViewProps extends ViewProps, ScrollViewPropsIOS, ScrollVi
      * When true the scroll view's children are arranged horizontally in a row
      * instead of vertically in a column. The default value is false.
      */
-    horizontal?: boolean;
+    horizontal?: boolean | null;
 
     /**
      * If sticky headers should stick at the bottom instead of the top of the
@@ -6584,13 +6583,13 @@ export interface ActionSheetIOSStatic {
 
 export type ShareContent =
     | {
-        title?: string;
-        message: string;
-    }
+    title?: string;
+    message: string;
+}
     | {
-        title?: string;
-        url: string;
-    };
+    title?: string;
+    url: string;
+};
 
 export type ShareOptions = {
     dialogTitle?: string;